Heating device for heating a fluid

Description

State of the art

[0001] A heating device for heating a fluid, in particular water, with at least one fluid guide unit for specifying a flow direction of the fluid and with at least one heating unit, in particular a heating coil unit, for transferring heat to the fluid has already been proposed.

[0002] The documents WO 2017 / 036872 A1, DE 19 68 231 U, DE 18 93 992 U, DE 196 51 079 A1, DE 196 51 087 A1, DE 10 91 249 B and DE 85 25 128 U1 disclose heating devices according to the prior art. Disclosure of the invention

[0003] The invention is based on a heating device for heating a fluid, in particular water, with at least one fluid guide unit for specifying a flow direction of the fluid and with at least one heating unit, in particular a heating coil unit, for transferring heat to the fluid.

[0004] It is proposed that the heating device comprise at least one fixing unit, in particular a clamping unit, for fixing the heating unit within the fluid guide unit. Preferably, the heating device is provided to heat the fluid by supplying electrical energy. Preferably, the fluid is water, in particular process water and / or drinking water. It is also conceivable for the fluid to be air and / or a heat transfer medium for a closed heating and / or cooling circuit, for example a hydrocarbon, ammonia, a thermal oil or the like. Preferably, the heating device comprises at least one inlet channel for the fluid to be heated to enter the heating device. Preferably, the heating device comprises at least one fluid outlet channel for the heated fluid to exit the heating device.Preferably, the inlet channel is arranged on the fluid guide unit, in particular formed integrally with the fluid guide unit. Preferably, the outlet channel is arranged on the fluid guide unit, in particular formed integrally with the fluid guide unit. Preferably, the outlet channel is fluidically connected to the inlet channel, in particular within the heating device, via the fluid guide unit.

[0005] The fluid guide unit preferably comprises at least one pipe section, one channel section, one shaft section, one hose section, and / or another fluid guide section deemed appropriate by a person skilled in the art for specifying a flow direction of the fluid, in particular from the inlet channel to the outlet channel. The fluid guide unit preferably comprises at least one heating channel. A "heating channel" is understood to mean, in particular, a fluid guide section in which the heating unit is arranged. The fluid guide unit preferably comprises at least two heating channels arranged at least substantially parallel, in particular the heating channel and another heating channel. According to the invention, the fluid guide unit comprises at least one fluid guide section designed as a bend, in particular a semi-annular bend.The bend is preferably arranged on at least the heating channel, preferably on two heating channels, particularly preferably on the at least substantially parallel heating channels. Preferably, at least two, in particular the at least substantially parallel, heating channels are fluidly connected to one another via the bend. Preferably, the fluid guide unit comprises at least one floor mounting element, in particular a floor half, and at least one ceiling mounting element, in particular a ceiling half, to form a fluid guide section. Preferably, at least two floor mounting elements, which are provided to form different fluid guide sections, are connected to one another in a materially bonded manner, in particular as a single piece. Preferably, at least two ceiling mounting elements, which are provided to form different fluid guide sections, are connected to one another in a materially bonded manner, in particular as a single piece."One-piece" should be understood in particular to mean molded in one piece. This one piece is preferably produced from a single blank, a mass, and / or a cast, particularly preferably using an injection molding process, in particular a single- and / or multi-component injection molding process. In particular, the fluid guide unit comprises at least two assembly half-shells to form at least a large part of the fluid guide sections. It is also conceivable for two fluid guide sections to be connected to one another via a flange, screw, plug-in, and / or clamp connection. It is conceivable for the heating device to comprise fluid flow regulation elements arranged on the fluid guide unit, for example a check valve, a control valve, a propeller unit, or the like.

[0006] The heating unit is preferably designed as a resistance heater. In particular, the heating unit is intended to increase its temperature by applying an electric current. The heating unit preferably has at least two connection elements for supplying electric current from a, in particular external, power source. The heating unit preferably has a current conductor unit, in particular with a positive resistance coefficient, between the connection elements. The current conductor unit preferably comprises a heating coil. It is also conceivable for the current conductor unit to have an at least substantially straight heating wire, a heating coil, a heating grid, a heating spiral and / or a heating wire with another shape that appears appropriate to a person skilled in the art. The heating coil preferably has at least one winding element, preferably more than ten winding elements, particularly preferably more than 50 winding elements.The heating coil is preferably arranged, in particular completely, within the fluid guide unit, in particular within at least the heating channel. A longitudinal axis of the heating unit, in particular of the heating coil, is preferably at least substantially parallel to a longitudinal axis of the heating channel. The connection elements preferably protrude partially into the fluid guide unit, in particular into the at least one heating channel. The heating unit, in particular the heating coil, is preferably arranged in at least two, in particular at least substantially parallel, heating channels and / or at least one bend. The at least two connection elements are preferably arranged in two, in particular at least substantially parallel, heating channels. At least one winding element of the heating coil is preferably arranged in each of two, in particular at least substantially parallel, heating channels.In particular, the heating coil is arranged at least substantially U-shaped within the fluid guide unit.

[0007] Preferably, the heating unit, in particular the heating coil, is secured within the fluid guide unit by means of the fixing unit. Preferably, the fixing unit restricts the range of movement of the heating unit, in particular the heating coil, within the fluid guide unit, as predetermined by the fluid guide unit. Preferably, the heating unit, in particular the heating coil, is arranged within the fluid guide unit by means of the fixing unit at at least one location of the heating unit in at least one direction, preferably in all spatial directions, at least substantially free of play. Preferably, the fixing unit is provided to fix the heating unit, in particular the heating coil, in an axial position within the fluid guide unit.The fixing unit is preferably provided to at least substantially prevent a relative movement of at least two points of the heating unit within the fluid guide unit relative to one another, in particular along a longitudinal axis of the fluid guide unit. In particular, the fixing unit is provided to fix at least one point of the current conductor unit, in particular the heating coil, relative to one of the connection elements and / or relative to another point of the current conductor unit, in particular the heating coil, in particular along a longitudinal axis of the fluid guide unit. The fixing unit preferably divides the heating unit into subsections, each of which has a fixed starting point and a fixed end point.Preferably, the heating unit is divided into subsections for a controlled arrangement of the heating unit in different fluid guide sections of the fluid guide unit, in particular in the heating channel, in the further heating channel, and / or the bend. Preferably, the fixing unit supports a longitudinal profile of the heating unit, in particular one that deviates from a straight line, in particular along a center line of the fluid guide unit, in particular the bend. A "controlled arrangement" is to be understood in particular as an arrangement in which a subsection of the heating unit, after fixing, remains within the fluid guide section assigned to it, and in particular spaced from an inner wall of the assigned fluid guide section, in particular despite internal tensioning and / or relaxation processes. The fixing unit is preferably designed as a clamping unit.The fixing unit, in particular at least two fixing elements of the fixing unit, preferably at least partially encloses the heating unit, in particular the heating coil, in at least one plane. The fixing unit, in particular the at least two fixing elements of the fixing unit, are preferably provided to simultaneously exert opposing forces on the heating unit. It is particularly conceivable for at least one fixing element of the fixing unit to be formed integrally, in particular in one piece, with the fluid guide unit, for example an inner wall of the fluid guide unit. The fixing unit is preferably arranged at least one point on the heating unit, in particular the heating coil, in at least one direction, preferably in all spatial directions, at least substantially free of play.It is particularly conceivable for the fixing unit designed as a clamping unit, in particular at least one fixing element of the fixing unit, to have an anti-slip portion which in particular has grooves, teeth, webs or the like, in order to prevent an evasive movement of the heating unit due to a clamping force. The fixing unit preferably projects into the heating unit, in particular into the heating coil. In particular, the heating unit, in particular the heating coil, in a fixed state has a taper in at least one section arranged on the fixing unit, in particular a taper complementary to the fixing unit, in particular created during fixing. It is also conceivable for the fixing unit to be designed as a screw unit and / or as a locking unit. Alternatively, the fixing unit can be designed as a materially integral connection, for example as a welded surface.Preferably, the fixing unit is designed differently from the connecting elements. Preferably, the fixing unit is arranged between the connecting elements, in particular spaced apart from the connecting elements, on the heating unit, in particular on the heating coil.

[0008] "Substantially parallel" is understood here to mean, in particular, an alignment of a direction relative to a reference direction, in particular in a plane, wherein the direction has a deviation from the reference direction of, in particular, less than 8°, advantageously less than 5°, and particularly advantageously less than 2°. "Intended" is understood to mean, in particular, specially designed and / or equipped. The fact that an object is intended for a specific function is understood to mean, in particular, that the object fulfills and / or performs this specific function in at least one application and / or operating state.

[0009] The inventive design of the heating device advantageously allows movement of the heating unit to be restricted, particularly during operation of the heating device. In particular, slippage of the heating unit can be advantageously prevented. In particular, a position of the heating unit relative to the fluid guide unit, particularly relative to an inner wall of the fluid guide unit, can advantageously be kept constant. In particular, noise generation due to movement of the heating unit relative to the fluid guide unit can advantageously be kept low.

[0010] It is further proposed that the fixing unit has at least one fixing element for preventing movement of at least one heating element, in particular at least one winding element of a heating coil, of the heating unit along a longitudinal axis of the heating unit. Preferably, a heating element of the heating unit is designed as a winding element, in particular as a winding element of a heating coil of the heating unit. It is also conceivable for the heating element to be designed as a straight conductor piece, as a U-shaped loop, as a spiral element and / or as a conductor piece with another shape that appears expedient to a person skilled in the art. Preferably, the fixing element is provided to prevent movement of the heating element of the heating unit along the longitudinal axis of the heating channel.The fixing element is preferably provided to prevent and / or minimize mechanical vibration of the heating element along the longitudinal axis of the heating channel and / or the heating unit, in particular the heating coil. The heating element is preferably arranged at least substantially free of play by means of the fixing element at least along the longitudinal axis of the heating unit and / or the heating channel. In particular, the fixing element is provided to cause a vibration node of a mechanical vibration of the heating unit along a longitudinal axis of the heating unit, in particular the heating coil, at the location of the heating element, at least during operation of the heating device. The fixing unit preferably has at least two, particularly preferably three, fixing elements arranged in a plane extending at least substantially perpendicular to a longitudinal axis of the heating channel.The term "substantially perpendicular" is intended here to define, in particular, an orientation of a direction relative to a reference direction, wherein the direction and the reference direction, in particular viewed in a plane, enclose an angle of 90°, and the angle has a maximum deviation of, in particular, less than 8°, advantageously less than 5°, and particularly advantageously less than 2°. Preferably, the fixing elements are arranged rotationally symmetrically or asymmetrically in the plane. Preferably, the heating unit is arranged, in particular clamped, between at least two fixing elements to fix the heating unit. It is particularly conceivable that, in order to fix the heating unit, the heating unit is arranged, in particular clamped, between the at least one fixing element and a structural element of the fluid guide unit, for example, an inner wall and / or a projection of the fluid guide unit.Preferably, at least one fixing element is designed as a clamping element, in particular a clamping jaw. It is also conceivable for the fixing element to be designed as a receiving element, in particular as a locking element for receiving the heating element, in particular at least substantially free of play. It is also conceivable for the fixing element to be designed as a locking element. The configuration according to the invention advantageously makes it possible to control a mechanical vibration of the heating unit along the longitudinal axis of the heating unit, in particular caused by operation of the heating device. In particular, at least one position of a point on the heating unit, in particular of the heating element, relative to the heating channel can be kept constant. In particular, noise development due to vibration of the heating unit along the longitudinal axis of the heating unit can advantageously be kept low.

[0011] It is further proposed that the at least one fixing unit is arranged at a bend in the fluid guide unit for deflecting the fluid. Preferably, the at least one fixing unit is attached to the bend which opens into the heating channel and / or the further heating channel, in particular is formed integrally with the heating channel and the further heating channel. Preferably, the at least one fixing unit is attached to the bend in which the heating unit is arranged. Preferably, the fixing unit comprises at least one fixing element which is arranged in a transition region of the fluid guide unit from the heating channel to the bend. Preferably, the fixing unit comprises at least one further fixing element which is arranged in a further transition region of the fluid guide unit from the bend to the further heating channel, in particular for fixing a further heating element of the heating unit.The bend preferably comprises at least one bend inlet to an inlet of the fluid, in particular from the heating channel. The bend preferably comprises a bend outlet to an outlet of the fluid, in particular into the further heating channel. The bend preferably comprises an imaginary center line that runs entirely inside the bend from the bend inlet to the bend outlet. An inner wall of the bend is preferably point-symmetrical in a plane at least substantially perpendicular to the center line with respect to a point of the center line contained in the plane. The center line preferably runs at least substantially entirely within a center plane.The term "a line runs essentially entirely in a plane" is to be understood in particular to mean that all points of at least a partial section of the line lie in the plane, with the sum of all partial sections corresponding to at least more than 33%, preferably more than 66%, particularly preferably more than 95% of a maximum length of the line. Preferably, the center plane is at least essentially parallel to the longitudinal axis of the heating channel and / or the further heating channel. Preferably, the bend in the center plane has an outer inner wall element and an inner inner wall element, which are arranged in particular on different sides of the center line. Preferably, the inner inner wall element has a shorter maximum extension than the outer inner wall element in the center plane. Preferably, the outer inner wall element has a curvature with an outer radius in the center plane.The inner inner wall element preferably has a curvature with an inner radius in the central plane. The inner inner wall element and the outer inner wall element are preferably arranged concentrically in the central plane. A difference between the outer radius and the inner radius preferably corresponds to a maximum transverse extent of the heating channel and / or the further heating channel, which is substantially perpendicular to the longitudinal axis of the heating channel. It is also particularly conceivable for the maximum transverse extent and the difference between the outer radius and the inner radius to be aligned with one another in the transition region from the heating channel to the bend and / or the further transition region from the bend to the further heating channel. The fixing unit is preferably arranged at least partially in the transition region and / or the further transition region.Preferably, a smallest imaginary cuboid that completely surrounds the fixing unit is arranged at least substantially flush with the bend, in particular at the bend entrance and / or the bend exit. The term "substantially flush" for two objects is to be understood in particular as meaning that two surfaces, each of which bounds one of the objects and is arranged at least substantially parallel, have a minimum distance from each other that is less than 50%, preferably less than 25%, particularly preferably less than 10%, of a maximum transverse extent of the smaller of the two surfaces. Alternatively or additionally, the fixing unit is arranged at least partially in the bend. Due to the inventive design, a length of a section of the heating unit, in particular of the heating coil, that is arranged in the bend is advantageously constant.In particular, deformation of the heating unit, particularly due to spring forces of the heating unit and / or due to operation, can be avoided. In particular, contact of the heating unit with an inner wall of the fluid guide unit, particularly the inner wall of the bend, can be advantageously avoided. In particular, noise generation due to movement of the heating unit relative to the fluid guide unit can advantageously be kept to a minimum.

[0012] Furthermore, it is proposed that at least one fixing plane delimiting a fixing region of the fixing unit, in particular a fixing plane extending at least substantially perpendicular to a longitudinal axis of a heating channel of the fluid guide unit, has a minimum distance relative to a bend of the fluid guide unit that is smaller than a maximum outer radius of the bend. Preferably, the fixing region is delimited along a mounting axis of the fixing unit by the fixing plane and a further fixing plane. Preferably, the fixing plane and the further fixing plane are arranged at least substantially parallel to one another and in particular at least substantially perpendicular to the mounting axis.Preferably, a maximum distance between the fixing planes is defined by a maximum extension of the at least one fixing element, in particular by a maximum extension of a contact surface of the fixing element with the heating unit, along the mounting axis. Preferably, the mounting axis is intended to be aligned substantially parallel to a longitudinal axis of the heating channel and / or the further heating channel during mounting of the heating device. Preferably, the fixing plane is arranged between the further fixing plane and the bend in an assembled state of the heating device. Preferably, a minimum distance of the fixing plane from the bend, in particular from a plane parallel to the fixing plane which at least partially encompasses the bend inlet, is smaller than the maximum outer radius of the bend.The inventive design advantageously allows a curvature of the heating unit, in particular of the heating coil, to be precisely adapted to a curvature of the bend. In particular, contact of the heating unit with an inner wall of the fluid guide unit, in particular the inner wall of the bend, can be advantageously avoided. In particular, noise generation due to movement of the heating unit relative to the fluid guide unit can advantageously be kept to a minimum.

[0013] Furthermore, it is proposed that the fixing unit comprise at least one support surface for guiding the heating unit between a fixing region of the fixing unit and a bend in the fluid guide unit, which support surface has a maximum longitudinal extent, in particular a maximum longitudinal extent at least substantially parallel to a longitudinal axis of a heating channel of the fluid guide unit, which is smaller than a maximum outer radius of the bend. Preferably, the support surface is provided to guide the heating unit, in particular the heating coil, along a straight path. Preferably, the support surface is arranged on the fixing element. Preferably, a maximum longitudinal extent of the fixing surface is at least substantially parallel to the mounting axis. Preferably, the maximum longitudinal extent of the fixing surface in an assembled state is at least substantially parallel to the longitudinal axis of the heating channel.The support surface is preferably at least partially concave for contact with the heating unit. A plane of curvature of the support surface is preferably at least substantially perpendicular to the mounting axis. A structural element of the fixing unit forming the support surface is preferably arranged at least substantially flush with the bend, in particular at the bend inlet and / or the bend outlet. The configuration according to the invention advantageously stabilizes a position of the heating unit, in particular of the heating coil, within the heating channel up to the bend. In particular, an advantageously small curvature of the heating unit, in particular of the heating coil, outside the bend can be realized. In particular, contact of the heating unit with an inner wall of the fluid guide unit, in particular in the transition region, can advantageously be avoided.In particular, noise development due to movement of the heating unit relative to the fluid guide unit can advantageously be kept low.

[0014] It is further proposed that the fluid guide unit be without a fixing unit in at least one bend-free section of the fluid guide unit, in which the at least one heating unit is arranged, along a continuous path which at least substantially corresponds to a maximum extent of the bend-free section. Preferably, the heating channel and / or the further heating channel are / is designed to be bend-free. In particular, the heating channel and / or the further heating channel are / is fluidically connected to one another via the bend. Preferably, an inner wall of the bend-free section, in particular of the heating channel, is designed to be at least substantially parallel to a longitudinal axis of the bend-free section, in particular of the heating channel. Preferably, the bend-free section extends at least from a feedthrough of the fluid guide unit for a connection element of the heating unit to the bend.Preferably, the continuous section without a fixing unit extends, in particular starting from the feedthrough, in particular from the connection element, over at least 25%, preferably 50%, particularly preferably 75% of a maximum extent of the bend-free section, in particular of the heating channel, in particular at least substantially parallel to the longitudinal axis of the bend-free section. Due to the design according to the invention, the heating unit can advantageously oscillate freely between the connection element and the fixing unit, which is arranged in particular at the bend. In particular, contact of the heating unit with an inner wall of the bend-free section, in particular of the heating channel, can advantageously be avoided. In particular, an advantageously low transmission of the oscillation from the heating unit to the bend-free section, in particular to the heating channel, can be brought about.In particular, noise development due to movement of the heating unit relative to the fluid guide unit can advantageously be kept low.

[0015] It is further proposed that the fixing unit has at least two fixing elements and at least one mounting base, wherein the fixing elements are arranged on the mounting base, in particular are formed integrally with the mounting base. Preferably, the mounting base has at least one partial mounting region for mounting the mounting base in the fluid guide unit. Preferably, the partial mounting region is formed at least substantially complementary to an intended mounting location of the fluid guide unit, in particular to the transition region from the heating channel to the bend. Preferably, the mounting base is arranged at the bend. Preferably, the mounting base is provided for positioning at least one fixing element within the fluid guide unit, in particular at a defined distance from the bend.The mounting base preferably comprises at least one fixing section, on which at least one fixing element is arranged. At least one fixing element is preferably arranged in the fixing section. The support surface is preferably arranged in the fixing section. In particular, a surface of the mounting base forms the support surface. The fixing element is preferably integrally connected to the mounting base, in particular in one piece. It is also conceivable in particular for the fixing element to be arranged on the mounting base via a plug-in, screw-in, clamp-in and / or snap-in connection. Preferably, at least two, particularly preferably three fixing elements are arranged on the mounting base, in particular integrally connected to the mounting base. The mounting base is preferably arranged concentrically, in particular rotationally symmetrically, to the heating unit.The mounting base preferably at least partially encompasses the heating unit in at least one plane, in particular in a plane substantially perpendicular to the longitudinal axis of the heating unit. The mounting base preferably has two mounting halves. It is particularly also conceivable for the mounting base to be formed in one piece and / or to be composed of more than two base body elements. At least one fixing element is preferably arranged on each mounting half. Two fixing elements are preferably arranged on at least one mounting half. Each mounting half preferably comprises a partial mounting region. The mounting base and the at least one fixing element arranged on the mounting base preferably form a fixing group of the fixing unit. The fixing unit preferably comprises at least one further fixing group. The fixing group and the further fixing group are preferably at least substantially identical in design.In particular, the fixing group and the further fixing group form an at least substantially mirror-symmetrical pair. Alternatively, the fixing group and the further fixing group have a different number and / or different types of fixing elements and / or further structural elements. In particular, the fixing group and the further fixing group are intended to fix the heating unit on different sides of the bend. Due to the inventive design, the fixing unit can advantageously be easily mounted. In particular, the fixing unit can advantageously be reliably arranged within the fluid guide unit.

[0016] It is further proposed that the fluid guide unit comprise at least one stop element for positioning the fixing unit. Preferably, the stop element is arranged on the bend. In particular, the stop element is arranged at the bend inlet and / or the bend outlet. Preferably, the stop element projects into the fluid guide channel, in particular into the bend inlet and / or the bend outlet. For example, the stop element is designed as a pin, cone, and / or bar. In particular, it is also conceivable for the stop element to have a main extension along the inner wall of the fluid guide unit, for example as a ring element, to narrow the cross-section of the fluid guide unit. Preferably, the stop element is provided for positioning the fixing unit, in particular the basic assembly body of the fixing unit, within the fluid guide unit.The inventive design advantageously allows a position within the fluid guide unit, in particular the bend inlet and / or bend outlet, to be identified. In particular, the fixing unit can advantageously be easily positioned in the fluid guide unit on the stop element. In particular, the fixing unit on the stop element can advantageously be arranged precisely within the fluid guide unit. In particular, the fixing unit, in particular the at least one fixing element, can be positioned at a defined distance from the bend on the stop element.

[0017] A continuous-flow heater, in particular a bare-wire water heater, comprising a heating device according to the invention is proposed. The continuous-flow heater preferably comprises a housing, in particular for protecting the heating device and / or a user. The continuous-flow heater preferably comprises at least one fluid inlet channel for admitting a fluid to be heated. The continuous-flow heater preferably comprises at least one fluid outlet channel for discharging the heated fluid. The heating device is preferably arranged fluidically between the fluid inlet channel and the fluid outlet channel. The continuous-flow heater preferably comprises a fluid regulating unit on the fluid inlet channel for adjusting a volume flow as a function of a pressure difference, in particular an externally generated one, between the fluid inlet channel and the fluid outlet channel.It is also conceivable for the instantaneous water heater to comprise a fluid conveying unit, for example a pump and / or a compressor, for conveying the fluid through the instantaneous water heater, in particular the heating device. The instantaneous water heater preferably has at least one power supply unit. The power supply unit preferably comprises at least one power connection for supplying the instantaneous water heater with power from an external source, in particular a public power grid. It is also conceivable for the power supply unit to comprise an internal power generation and / or storage unit, for example a battery unit, an accumulator unit and / or a power generator. The instantaneous water heater preferably has at least one user interface for operating the instantaneous water heater, in particular by a user.For example, the user interface is designed to adjust a fluid quantity and / or a fluid temperature. The instantaneous water heater preferably comprises a sensor unit for measuring at least one fluid and / or operating parameter, for example, a fluid temperature, a volume flow, an inlet pressure of the fluid, energy consumption, an electric current, or the like. The instantaneous water heater preferably comprises a control or regulating unit for controlling or regulating a fluid and / or operating parameter. A "control and / or regulating unit" is understood in particular to mean a unit with at least one control electronics unit. "Control electronics" is understood in particular to mean a unit with a processor unit and a memory unit, as well as with an operating program stored in the memory unit.The instantaneous water heater preferably includes a differential pressure switch for controlling the amount of heat supplied via the heating device as a function of a volume flow. The design according to the invention makes it possible to provide an advantageously low-noise instantaneous water heater.

[0018] A method is proposed for assembling a heating device, in particular a heating device according to the invention, which comprises at least one fluid guide unit for specifying a flow direction of a fluid and at least one heating unit, in particular a heating coil unit, for transferring heat to the fluid, in which method the heating unit is fixed within the fluid guide unit by means of a fixing unit of the heating device in at least one method step. Preferably, in at least one method step, the fixing unit is arranged, in particular inserted, into the fluid guide unit. Preferably, at least the fixing group of the fixing unit is arranged in the fluid guide unit, in particular in the transition region of the heating channel into the bend. Preferably, at least the further fixing group of the fixing unit is arranged in the fluid guide unit, in particular in the further transition region of the further heating channel into the bend.Preferably, at least part of the fixing unit, in particular at least one assembly half of the fixing group and / or the further fixing group, is arranged in an assembly half-shell of the fluid guide unit. Preferably, at least part of the fixing unit, in particular at least one assembly half of the fixing group and / or the further fixing group, is arranged in one of the assembly half-shells of the fluid guide unit. Preferably, the fixing unit is positioned in the fluid guide unit using the stop element. It is particularly conceivable that the fixing unit is fastened to the fluid guide unit in at least one further method step, in particular additionally, for example by means of a screw and / or welded connection. Preferably, the heating unit is arranged in the fluid guide unit in at least one method step.Preferably, in at least one method step, the heating unit, in particular the heating coil, is arranged at least partially along the heating channel. Preferably, in at least one method step, the heating unit, in particular the heating coil, is arranged at least partially along the bend. Preferably, in at least one method step, the heating unit, in particular the heating coil, is arranged at least partially along the further heating channel. Preferably, in at least one method step, the heating unit, in particular the heating coil, is arranged on at least one fixing element of the fixing group. Preferably, in at least one method step, the heating unit, in particular the heating coil, is arranged on at least one fixing element of the further fixing group. Preferably, in at least one method step, the heating unit, in particular the heating coil, is arranged on the support surface.Preferably, the assembly half-shells are arranged next to one another in at least one method step. In particular, the heating unit, in particular the heating coil, is clamped by the fixing unit in at least one method step. Preferably, the assembly half-shells are integrally connected to one another, in particular welded, in at least one method step. It is also conceivable, in particular, for the assembly half-shells to be connected to one another by a pressing process and / or screwing process. The inventive design of the method allows for the assembly of an advantageously low-noise heating device. In particular, assembly of the low-noise heating device can be advantageously made simple.

[0019] The heating device according to the invention, the instantaneous water heater according to the invention, and / or the method according to the invention are not intended to be limited to the application and embodiment described above. In particular, the heating device according to the invention, the instantaneous water heater according to the invention, and / or the method according to the invention may, in order to fulfill a function described herein, have a number of individual elements, components, units, and method steps that differs from the number stated herein. Furthermore, in the value ranges specified in this disclosure, values ​​within the stated limits are also to be considered disclosed and can be used arbitrarily. Drawings

[0020] Further advantages will become apparent from the following description of the drawings. The drawings illustrate an exemplary embodiment of the invention. The drawings, the description, and the claims contain numerous features in combination.

[0021] They show: Fig. 1 is a schematic representation of a continuous flow heater according to the invention, Fig. 2 is a schematic representation of a heating device according to the invention in a partially assembled state, Fig. 3 is a schematic representation of a fixing unit of the heating device according to the invention, Fig. 4 is a schematic representation of a longitudinal section of the fixing unit, Fig. 5 is a schematic representation of a cross section of the fixing unit and Fig. 6 is a flow chart of a method according to the invention. Description of the embodiment

[0022] Figure 1shows a flow heater 56, in particular a bare-wire water heater, with a heating device 10. The heating device 10 is provided for heating a fluid 12, in particular water. The heating device 10 comprises at least one fluid guide unit 14 for specifying a flow direction 16 of the fluid 12. The flow heater 56 preferably comprises a housing 60, in particular for protecting the heating device 10 and / or a user. The flow heater 56 preferably comprises at least one fluid inlet channel 62 for admitting a portion 64 of the fluid 12 to be heated. The flow heater 56 preferably comprises at least one fluid outlet channel 66 for discharging the heated portion 68 of the fluid 12.Preferably, the flow heater 56 comprises a fluid regulation unit 70, in particular a control valve, on the fluid inlet channel 62, for adjusting a volume flow as a function of a pressure difference, in particular an externally generated one, between the fluid inlet channel 62 and the fluid outlet channel 66. The heating device 10 comprises at least one heating unit 18, in particular a heating coil unit, for transferring heat to the fluid 12. The heating device 10 comprises at least one fixing unit 20 (see . Figures 2 to 5), in particular a clamping unit, for fixing the heating unit 18 within the fluid guide unit 14. The instantaneous water heater 56 preferably has at least one power supply unit 72. The power supply unit 72 preferably comprises at least one power connection for supplying the instantaneous water heater 56 with power from an external source, in particular a public power grid. The instantaneous water heater 56 preferably has at least one user interface 74 for operating the instantaneous water heater 56, in particular by a user. For example, the user interface 74 is provided for setting a fluid quantity and / or a fluid temperature. The instantaneous water heater 56 preferably comprises a sensor unit 76 for measuring at least one fluid and / or operating parameter, in particular a fluid temperature.The flow heater 56 preferably comprises a control or regulating unit 78 for controlling or regulating a fluid and / or operating parameter. The flow heater 56 preferably comprises a differential pressure switch 80 in the fluid inlet channel 62 for controlling the amount of heat supplied to the fluid 12 via the heating device 10 as a function of a volume flow in the fluid inlet channel 62. The flow heater 56 preferably comprises at least one further fluid regulating unit embodied as a check valve 82. The check valve 82 is preferably arranged on the fluid inlet channel 62, in particular between the heating device 10 and the differential pressure switch 80.

[0023] Figure 2shows the heating device 10 in a pre-assembled state, in particular without the heating unit 18 for the sake of clarity. The fluid guide unit 14 preferably comprises at least two mounting half-shells 84, 86 for forming fluid guide sections. The fluid guide unit 14 preferably comprises at least one heating channel 42. The fluid guide unit 14 preferably comprises at least one further heating channel 88. The fluid guide unit 14 preferably comprises at least one bend 34. The bend 34 is preferably arranged on at least the heating channel 42. The bend 34 is preferably arranged on at least the further heating channel 88. The bend 34 preferably fluidically connects the heating channel 42 and the further heating channel 88 to one another. The heating channel 42, in particular a longitudinal axis 40 of the heating channel 42, and the further heating channel 88, in particular a longitudinal axis 90 of the further heating channel 88, are preferably arranged at least substantially parallel.Preferably, at least one passage 92 for a connection element of the heating unit 18 is arranged at an end opposite the bend 34 along the longitudinal axis 40 of the heating channel 42. Preferably, at least one further passage 94 for a connection element of the heating unit 18 is arranged at an end opposite the bend 34 along the longitudinal axis 90 of the further heating channel 88. The at least one fixing unit 20 is arranged at the bend 34 for deflecting the fluid 12 of the fluid guide unit 14 (see also . Figure 3). Preferably, the fixing unit 20, in particular a fixing group 102 of the fixing unit 20, is arranged in a transition region 96 from the heating channel 42 into the bend 34. Preferably, the fixing unit 20, in particular a further fixing group 104, is arranged in a further transition region 98 from the bend 34 into the further heating channel 42. The fluid guide unit 14 is without a fixing unit in at least one bend-free section 50 of the fluid guide unit 14, in which the at least one heating unit 18 is arranged, along a continuous path which at least substantially corresponds to a maximum extent of the bend-free section 50. Preferably, the bend-free section 50 is formed by the heating channel 42. Preferably, a further bend-free section 100 is formed by the further heating channel 88.In particular, the heating channel 42 between the feedthrough 92 and the bend 34 is free of a fixing unit along a continuous path that at least substantially corresponds to a maximum extension of the heating channel 42. In particular, the further heating channel 88 between the feedthrough 94 and the bend 34 is free of a fixing unit along a continuous path that at least substantially corresponds to a maximum extension of the heating channel 88. The fluid guide unit 14 comprises at least one stop element 54, 54' for positioning the fixing unit 20. In particular, the stop element 54 marks a bend inlet of the bend 34. In particular, the stop element 54' marks a bend outlet of the bend 34.

[0024] Figure 3shows an enlarged section of the fluid guide unit 14 with the bend 34 and the fixing unit 20, in particular with the fixing group 102 and the further fixing group 104 of the fixing unit 20. Figure 4 shows a longitudinal section of the fixation group 102 and Figure 5a cross-section of the fixing group 102. The fixing group 102 and the further fixing group 104 are preferably at least substantially identical in design. In particular, the fixing group 102 and the further fixing group 104 form an at least substantially mirror-symmetrical pair. The fixing unit 20, in particular the fixing group 102 and / or the further fixing group 104, has at least two fixing elements 22, 22', 24, 24', 26 and at least one mounting base body 52, 52', wherein the fixing elements 22, 22', 24, 24', 26 are arranged on the mounting base body 52, 52', in particular are formed integrally with the mounting base body 52, 52'. The mounting base body 52, 52' preferably has two mounting halves 106, 106', 108. Preferably, at least one of the fixing elements 22, 22', 24, 24', 26 is arranged on each mounting half 106, 106', 108.Preferably, two of the fixing elements 22, 22', 24, 24', 26 are arranged on at least one of the mounting halves 106, 106', 108, 108'. Preferably, each of the mounting halves 106, 106', 108, 108' comprises a mounting sub-region 110, 112, which is designed, in particular, to be complementary to the fluid guide unit 14, in particular to the transition region 96 and / or the further transition region 98. It is particularly conceivable for the mounting base body 52, 52' to have a receiving element 114 for arranging, in particular applying and / or plugging, the mounting base body 52, 52' onto the stop element 54, 54'. The fixing unit 20 has at least the fixing element 22, 22', 24, 24', 26 for preventing a movement of at least one heating element 28 (in . Figure 5indicated), in particular at least one winding element of a heating coil 30, of the heating unit 18 along the longitudinal axis 32 of the heating unit 18. In particular, the fixing elements 22, 22', 24, 24', 26 are designed as clamping jaws. Preferably, at least two, preferably three, of the fixing elements 22, 22', 24, 24', 26 encompass the heating unit 18 in at least one plane, in particular in a plane perpendicular to the longitudinal axis 32 of the heating unit 18, at least partially, in particular at least substantially rotationally symmetrically. At least one fixing plane 38 delimiting a fixing region 36 of the fixing unit 20, in particular a fixing plane 38 extending at least substantially perpendicular to the longitudinal axis 40 of the heating channel 42 of the fluid guide unit 14, has a minimum distance 44 relative to the bend 34 of the fluid guide unit 14, which is smaller than a maximum outer radius 46 of the bend 34.The fixing unit 20 comprises at least one support surface 48, 48' for guiding the heating unit 18 between the fixing region 36, 36', the fixing unit 20 and the bend 34 of the fluid guide unit 14, which has a maximum longitudinal extent, in particular a maximum longitudinal extent at least substantially parallel to the longitudinal axis 40 of the heating channel 42 of the fluid guide unit 14, which is smaller than the maximum outer radius 46 of the bend 34.

[0025] Figure 6shows a method 58 for assembling the heating device 10, wherein in at least one method step the heating unit 18 is fixed within the fluid guide unit 14 by means of the fixing unit 20. Preferably, during a fixing unit assembly 116, the fixing unit 20 is arranged, in particular inserted, into the fluid guide unit 14. Preferably, at least the fixing group 102 of the fixing unit 20 is arranged in the fluid guide unit 14, in particular in the transition region 96 of the heating channel 42 into the bend 34. Preferably, at least the further fixing group 102 of the fixing unit 20 is arranged in the fluid guide unit 14, in particular in the further transition region 98 of the further heating channel 88 into the bend 34.Preferably, at least a portion of the fixing unit 20, in particular at least one of the mounting halves 106, 106', 108, 108' of the fixing group 102 and / or the further fixing group 104, is arranged in one of the mounting half-shells 84, 86 of the fluid guide unit 14. Preferably, at least a portion of the fixing unit 20, in particular at least one mounting half 106, 106', 108, 108' of the fixing group 102 and / or the further fixing group 104, is arranged in one of the mounting half-shells 84, 86 of the fluid guide unit 14. Preferably, the fixing unit 20 is positioned in the fluid guide unit 14 using the stop element 54, 54'. Preferably, the heating unit 18 is arranged in the fluid guide unit 14 during a heating unit arrangement 118. Preferably, in at least one method step, the heating unit 18, in particular the heating coil 30, is arranged at least partially along the heating channel 42.Preferably, in at least one method step, the heating unit 18, in particular the heating coil 30, is arranged at least partially along the bend 34. Preferably, in at least one method step, the heating unit 18, in particular the heating coil 30, is arranged at least partially along the further heating channel 88. Preferably, in at least one method step, the heating unit 18, in particular the heating coil 30, is arranged on at least one of the fixing elements 22, 24, 26 of the fixing group 102. Preferably, in at least one method step, the heating unit 18, in particular the heating coil 30, is arranged on at least one of the fixing elements 22', 24' of the further fixing group 104. Preferably, in at least one method step, the heating unit 18, in particular the heating coil 30, is arranged on the support surface 48. Preferably, during a fluid guide unit closure 120, the mounting half-shells 84, 86 are arranged against one another.In particular, in at least one method step, in particular by the arrangement of the assembly half-shells 84, 86, the heating unit 18, in particular the heating coil 30, is clamped by the fixing unit 18. Preferably, in at least one method step, the assembly half-shells 84, 86 are integrally connected to one another, in particular welded.

Claims

1. Heating device for heating a fluid (12), in particular water, having at least one fluid-guiding unit (14) for predefining a flow direction (16) of the fluid (12), and having at least one heating unit (18), in particular a heating coil unit, for transferring heat to the fluid (12), and having at least one fixing unit (20), in particular clamping unit, for fixing the heating unit (18) within the fluid-guiding unit (14), wherein the at least one fixing unit (20) is arranged at a bend (34), for deflecting the fluid (12), of the fluid-guiding unit (14), characterized in that the fluid-guiding unit (14) does not have a fixing unit in at least one bend-free portion (50) of the fluid-guiding unit (14), the at least one heating unit (18) being arranged in said bend-free portion, along a continuous section which corresponds at least substantially to a maximum extent of the bend-free portion (50).

2. Heating device according to Claim 1, characterized in that the fixing unit (20) has at least one fixing element (22, 22', 24, 24', 26) for preventing a movement of at least one heating element (28), in particular at least one turn element of a heating coil (30), of the heating unit (18) along a longitudinal axis (32) of the heating unit (18).

3. Heating device according to either of the preceding claims, characterized in that at least one fixing plane (38) which delimits a fixing region (36) of the fixing unit (20), in particular a fixing plane (38) which runs at least substantially perpendicular to a longitudinal axis (40) of a heating channel (42) of the fluid-guiding unit (14), has a minimum distance (44) relative to a bend (34) of the fluid-guiding unit (14) which is smaller than a maximum outer radius (46) of the bend (34).

4. Heating device according to one of the preceding claims, characterized in that the fixing unit (20) comprises at least one support surface (48, 48') for guiding the heating unit (18) between a fixing region (36, 36'), the fixing unit (20) and a bend (34) of the fluid-guiding unit (14), said at least one support surface having a maximum longitudinal extent, in particular a maximum longitudinal extent at least substantially parallel to a longitudinal axis (40) of a heating channel (42) of the fluid-guiding unit (14), which is smaller than a maximum outer radius (46) of the bend (34).

5. Heating device according to one of the preceding claims, characterized in that the fixing unit (20) has at least two fixing elements (22, 22', 24, 24', 26) and at least one mounting base body (52, 52'), wherein the fixing elements (22, 22', 24, 24', 26) are arranged on the mounting base body (52, 52'), in particular are formed in one part with the mounting base body (52, 52').

6. Heating device according to one of the preceding claims, characterized in that the fluid-guiding unit (14) comprises at least one stop element (54, 54') for positioning the fixing unit (20).

7. Continuous-flow heater, in particular bare-wire water heater, having a heating device according to one of Claims 1 to 6.

8. Method for mounting a heating device, in particular a heating device according to one of Claims 1 to 6, which comprises at least one fluid-guiding unit (14) for predefining a flow direction (16) of a fluid (12), and at least one heating unit (18), in particular a heating coil unit, for transferring heat to the fluid (12), wherein the fluid-guiding unit (14) does not have a fixing unit in at least one bend-free portion (50) of the fluid-guiding unit (14), the at least one heating unit (18) being arranged in said bend-free portion, along a continuous section which corresponds at least substantially to a maximum extent of the bend-free portion (50), characterized in that, in at least one method step, the heating unit (18) is fixed by means of a fixing unit (20) of the heating device within the fluid-guiding unit (14) at a bend (34), for deflecting the fluid (12), of the fluid-guiding unit.